GAINESVILLE - We are following the Pedro Bravo murder trial into its fourth day. The case went from a missing person, to a fight between friends, to a murder.

Attorneys displayed more evidence regarding the disappearance of Christian Aguilar almost two years ago. Now the prosecution is trying to use receipts and surveillance video to link Bravo to the crime.

Receipts were found on top of Bravos dresser in his room at Spyglass apartments. One receipt is from Walmart, where a knife, duct tape and sleeping pills, were purchased. The other receipt is also from Walmart for an $0.88 ankle wrap and $80 cash back. Another receipt is from Lowe's for a shovel.

Inside his apartment Y-177 officer Marc Trahan a Crime Scene Analyst, with the Gainesville Police Department, identified articles of clothing inside Bravo's dryer. One of them, a black camelback hoodie that reads, "what comes up must come down." The state says those are the clothes he was wearing on September 20th 2012.

Inside his car two different things tested positive for blood; the left insole of a shoe and a black paint can. "The processing of the can when I turned it over to work on the bottom I noticed that it had a stain that was indicative of a blood stain. When I field tested it, it tested positive. So I took a swan of it and completed the processing," Trahan said.

The state called a representative of Walmart's asset protection division to talk about surveillance video. The images exposed in court show Bravo holding a shovel and paying in cash. Now where was that shovel found?

It was implied in court that, the very same shovel was found at the Spyglass Complex under boardwalk. When tested, sand on it did not match the ground it was resting on in Spyglass.

Marc Woodmansee an Investigator for the Gainesville Police Department said, "During the service of a search warrant each item thats collected has to be made-- you have to make. Almost of each individual item. And leave it at the scene or with the person that you are seizing it from to document what you've removed from their property."

The defense claims that Bravo was suicidal and that during his encounter with Aguilar, that Aguilar made things worse by telling him "Why don't you just go ahead and kill yourself?" And that was what instigated a fight.

I will be tweeting live from the courthouse all week long, follow me on Twitter @BecharaReports.